Video from my YouTube channel

Subscribe to My You tube channel

nominated subcontractor

By -
the nominated subcontractor is a subcontractor who stated in contracts or whom the engineer instruct the contractor to employ under clause 13.






the contractor has the right to object the nomination. the contractor shall notify the engineer of his objection providing supporting evidence. the objection shall be deemed reasonable if the objection arises from following

  1. The nominated subcontractor has insufficient competence, resources or finance strength.
  2. if the subcontract doesn't specify that the nominated subcontractor shall indemnify the contractor for any damage such as misuse of goods or any kind of negligence caused by a nominated subcontractor or his agents.
  3.  if the subcontract doesn't specify for the subcontracted work that nominated subcontractor shall     
  • be liable and obligated for subcontracted work. therefore the contractor will be able to discharge his obligation and liabilities under the contract
  •   indemnify the contractor against any obligation or liabilities arising from contract and any failure to perform obligations and liabilities   
the objection can be rejected if the engineer accepted to indemnify the contractor against and from any consequences arises from previous points     

payment for nominated subcontractor shall be done by the contractor. the contractor shall pay the nominated subcontractor the amount certified by the engineer. the engineer may ask the contractor to provide evidence of paying the nominated subcontractor for previous payment certificates.
if the contractor didn't pay the subcontractor then the employer may pay the nominated subcontractor directly for all pending certified amounts. then the contractor should repay the employer all the paid amounts.






      

Comments

Post a Comment

Videos from My Youtube channel

Popular posts from this blog

stress-strain diagram for aluminium alloy and rubber

By -
Image
figure no:1 showing the stress-strain diagram for aluminum alloy. we can notice from the stress-stress diagram that aluminum has a considerable ductility. despite the absence of explicit yield point as in structural steel . the initial portion of the stress-strain curve is linear with a recognizable proportional limit. the proportional limit for aluminum alloy ranges from 70 to 410 Mpa (10 to 60 Ksi). aluminum alloy undergoes large strain before failure. ultimate stress ranges from 140 to 550 Mpa (20 to 80 Ksi). construction management: concrete construction bridge construction:How to become a bridge engineer Figure-1 Yield stress for aluminum alloy can be determined by drawing offset line parrel to the linear portion of the stress-strain curve. the straight line offset by a standard strain such as 0.002. the intersection point with the stress-strain curve is the point of yield stress. figure no:2 illustrates the concept of offset method. yield stress acquire...
Read more

Bar Bending schedule (BBS)

By -
Image
 The bar  bending schedule is a table that contains the details of reinforcement for a specific structural member such as footing, column, slab, and others. The bar bending schedule will contain the bars' dimensions to be used, the shape of the bars, the size of bars, bar mark, number of bars, and the weight of bars. BBS will be used to determine the weight of reinforcement required for a specific structural member.  there are various advantages of bar bending schedule such as: estimating the quantity of reinforcement for each structural member. So we can estimate the amount of reinforcement required for a construction project.  BBS will help in reducing the losses of steel by procuring the precise quantity of different rebar diameter.  BBS will reduce the wastage of reinforcement by providing the engineers with the exact dimension and shape of rebars. Knowing the exact dimension and shape will reduce the time of cutting and bending rebars.  BBS will reduce...
Read more

Rebar Splicing and Overlapping — ACI 318-19 Requirements Explained

By -
Image
Reinforcement splicing or overlapping is a fundamental requirement in reinforced concrete structures. Because reinforcement bars (rebars) are manufactured in limited standard lengths—typically 12 m —it becomes necessary to splice or overlap them to achieve the required continuity in structural members. The main purpose of a splice is to ensure smooth stress transfer between adjacent bars through the surrounding concrete. The overlap length, commonly known as the splice length , must be long enough to safely transfer the tensile stresses from steel to concrete without causing bond failure. It is recommended to avoid splicing in high-stress zones such as areas of maximum moment, and to stagger the splices to prevent congestion and reduce stress concentration. The ACI 318-19 providing the following recommendatin and requirement for the lap splicing: 1. Splice Limitation by Bar Size Lap splicing is not permitted for reinforcement bars larger than 36 mm in diameter. 2. Non-Contact L...
Read more

Can AI Be Trusted with Structural Analysis? Lessons from Beam Calculations

By -
  Artificial intelligence can produce an engineering answer in seconds. It can explain a method, write equations, and present a calculation that looks convincing. For a structural engineer, however, the decisive question is whether that answer accurately represents how the structure behaves. A June 2026 paper by Mohammad Mamon Fayiz Hamdan, An Assessment of Artificial Intelligence Capabilities in Structural Analysis: A Comparative Study of Determinate and Indeterminate Beams, examines this question through beam analysis. What the study tested The study evaluated ChatGPT, DeepSeek, Gemini, and Perplexity using beam problems with different levels of static indeterminacy and complexity. Their answers were compared with classical analytical solutions using the force and slope-deflection methods, alongside SAP2000 results. The reported pattern was clear: the tested AI systems produced reasonably accurate answers for determinate beams and some systems with low indeterminacy, while discre...
Read more

Construction Safety Management: Turning Policy into Action

By -
A safety plan can be approved, filed, and available in the site office while the people doing the work still face unresolved hazards. The question for a project team is whether that plan changes what happens at the workface. The May 2024 paper Safety Management at Construction Projects: A Case Study of Infrastructure Projects, by Mohammad Mamon Hamdan and Salahaldeen Hamdan, examines safety management through infrastructure construction examples.[1] Give responsibility the authority to act The authors describe a safety management system built around policy, responsibilities, implementation, and evaluation. They emphasise shared responsibility and the authority needed to address hazards.[1] A practical interpretation is to connect every important safety requirement to a person and a decision. Who verifies readiness? Who resolves an unsafe condition? Who can stop the activity? Who confirms that work may resume? These questions make accountability visible. They also help supervisors under...
Read more

Bridge Top slab

By -
Image
Once the curing of bottom slab and web completed. The construction of the top slab will begin. Top slab usually has a small width, therefore using cup-lock as a supportive system (falsework) will be enough. Top slab construction is simple and can be done in a shorter time compared to web and bottoms slab. The reinforcement for the top slab usually consists of four layers of reinforcement — two layers in each direction. The reinforcement in short direction will be more. As we know, the loads will be transferred in a short direction. Figure 1 construction management: concrete construction bridge construction:How to become a bridge engineer After the erection of falsework system. Primary beams will be installed at intervals in the short direction. Intervals between the primary beam shall be matching the calculation by the designer. Above the primary beam and in the longitudinal direction, the secondary beam will be fixed to support the formwork for top slab. ...
Read more

Building Roads That Last: Quality Management in Flexible Pavement Construction

By -
  A newly completed road can look excellent on opening day. For the project team, the more demanding question is whether the evidence behind that finished surface justifies confidence in its long-term performance. That question is central to Critical Aspects of Quality Management in Flexible Pavement Construction, a December 2024 paper by Mohammad Mamon Hamdan. Quality begins before paving The paper presents pavement quality as a responsibility extending through design, construction, and testing. It identifies ground conditions, climate, traffic loading, material quality, and construction practices as interconnected influences on performance.[1] Flexible pavement consists of layers that transfer traffic loads to the ground beneath them. The paper stresses that subgrade investigation, realistic traffic assessment, and consideration of temperature and moisture must inform the design. It also highlights drainage, material testing, and proper laying and compaction as important controls...
Read more

Construction Field Management: A Practical Guide for Civil Engineers and Site Engineers

By -
 Learn How to Manage Construction Activities, Project Documents, Site Quality, and Safety Successful construction projects require more than technical design knowledge. Engineers working on construction sites must understand project documents, coordinate with different teams, monitor construction activities, ensure compliance with specifications, and maintain quality and safety throughout project execution. From reviewing contract drawings and bills of quantities to inspecting reinforcement, supervising concrete works, and managing excavation activities, construction field management involves a wide range of practical responsibilities. For civil engineers, graduate engineers, site engineers, and construction professionals, developing these skills is essential for improving site performance and building a strong foundation for career growth. If you want to strengthen your practical engineering knowledge, the Construction Management: Construction Field Management course by Mohammad ...
Read more

Pile cap

By -
Image
Pile cap used to transfer the loads from superstructure to the piling. The pile cap is thick concrete mat rests on piles. It is part of the foundation and used to distribute the loads over the piles. Piles used when the soil bearing is not enough to carry loads of the structure. Figure 1  construction management: concrete construction bridge construction:How to become a bridge engineer Pile cap construction procedure Excavation around piles: After 7 days of the casting of the pile the concrete will gain approximately, 70% of it is compressive strength. The soil around piles will be removed to the required levels and dimension that allows construction of the pile cap. A step shall be made if the excavation is more than 1.5 m to prevent soil collapse. Figure 2 Pile head cutting: Concrete will be removed up to cut off level. If concrete under the cut off level is unsound. It shall be removed, and the pile will be repaired...
Read more

Fiber Reinforced polymer for strengthening of reinforced concrete

By -
Image
 Fiber-reinforced plastic (FRP) is a new technique to strengthen structures. Fiber-reinforced plastic has various types, such as a carbon-fiber-reinforced polymer (CFRP), glass fiber reinforced plastic (GFRP), and aramid fiber-reinforced polymer (AFRP).  The below table shows the mechanical properties of different fiber types.     Table 1 we can notice that carbon fiber reinforced polymer possesses better properties compared to other types. For example, the tensile strength of CFRP extra-high strength can reach 6200 MPA compared to a maximum tensile strength of 4135 MPA of other fiber types.   The FRP has various uses such as: Improved seismic performance of masonry walls Replacing missing steel reinforcement Increasing the strength and ductility of columns Increasing the loading capacity of structural elements Correcting structural design and/or construction defects Increasing resistance to seismic movement Improving service life and durability ...
Read more