General Contractor Practice Exam

What is a more frequent factor contributing to formwork failure than vertical overloading?

1. Inadequate vertical support

2. Inadequate cross and horizontal bracing

3. Excessive weight of concrete

4. Poor quality materials

The correct answer is: Inadequate cross and horizontal bracing

Inadequate cross and horizontal bracing is a more frequent factor contributing to formwork failure than vertical overloading because bracing provides the necessary lateral support to the formwork system. Without proper bracing, the formwork can sway, move, or collapse under the weight of the concrete and other forces. Bracing ensures that the forms maintain their shape and position when concrete is poured and during curing. A lack of adequate bracing can lead to structural instability, regardless of whether the vertical load is within acceptable limits. While vertical support is crucial, it is the horizontal and cross bracing that prevents lateral movement and potential failures, especially in windy conditions or when high pressures are exerted during pouring. Additionally, the weight of concrete, while significant, is generally accounted for in the design and analysis of the formwork system. Similarly, poor-quality materials can lead to problems, but issues predominantly arise from improper bracing practices, making bracing a more frequent cause of failure in construction projects.